Analysis by: Rika Joi Gregorio
ALIASES:

Trojan-Ransom.Win32.PornoAsset.ckkk(Kaspersky), TrojanDropper:Win32/Rovnix.L(Microsoft), Trojan.Cidox.C(Symantec), PWSZbot-FRG!56DB6A59AEBB(McAfee), Trojan-PWS.Win32.Fareit(Ikarus), a variant of Win32/Kryptik.BRHX trojan(Eset)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet, Dropped by other malware

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It restarts the affected system.

  TECHNICAL DETAILS

File Size: 280,576 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 04 Sep 2014
Payload: Steals information

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Trojan drops the following files:

  • %System%\{random file name}

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

It drops and executes the following files:

  • {malware path}\{random 8 characters}.bat - used to delete itself

Other Details

This Trojan checks for the presence of the following process(es):

  • vmusrvc.exe
  • vpcmap.exe
  • vmsrvc.exe
  • vboxservice.exe
  • vboxtray.exe
  • ollydbg.exe
  • windbg.exe
  • idag.exe
  • idag64.exe
  • pexplorer.exe
  • lordpe.exe
  • hiew32.exe
  • bindiff.exe
  • wireshark.exe

It restarts the affected system.

NOTES:

It modifies the NTFS boot sector to load its encrypted code.

It also hooks the following APIs:

  • NtQueryDirectoryFile
  • NtClose
  • NtOpenFile
  • NtQueryInformationFile
  • NtSetInformationFile
  • NtCreateFile
  • NtDeleteFile
  • NtShutdownSystem
  • NtOpenKey
  • NtEnumerateKey
  • NtCreateKey

This malware log keys, Ammyy Admin IDs, and passwords.

  SOLUTION

Minimum Scan Engine: 9.700
FIRST VSAPI PATTERN FILE: 11.128.05
FIRST VSAPI PATTERN DATE: 05 Sep 2014
VSAPI OPR PATTERN File: 11.129.00
VSAPI OPR PATTERN Date: 05 Sep 2014

NOTES:

For Trend Micro product users, use the ATTK with ATRT to restore the modified Initial Program Loader (IPL) of an active NTFS partition.


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